Inductive or transformer bond.



J. S. LENNOX. INDUCTIVE 0R TRANSFORMER BOND. APPLICATION FILED MAR. e, 1912.

1,085,616. v Patented Feb. 3, 1914.

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10 FIG. 1

WITNESSES J. S. LEN NOX. INDUOTIVB 0R TRANSFORMER BOND.

APPLICATION FILED MAR. 6, 1912.

Patented Feb. 3, 1914.

2 SHEETS-SHEET 2,.

FIG. 3

INVENTOR [W A ATTORNEY WITNESSES UNITE STATES 1 A TENT GFFICE.

JOHN S. LENNOX, 0F PITTSFIELD, MASSACHUSETTS, ASSIGNGR, BY'MESNE ASSIGN- MENTS, TO THE UNION SWITCH AND SIGNAL COMPANY, A CORPORATION OF PENNSYLVANIA.

INDUCTIVE 0R TRANSFORMER BGND.

Specification of Letters Patent.

. Patented Feb. 3, 191 1.

Application filed March 6, 1912. Serial No. 681,945.

1 b rzZZ whom it may concern.

lie it known that I, JOHN S. LENNOX, a subject or the King of Great Britain, re-' siding at Pi'ttsfield, in the county of Berkshire and State of Massachusetts, have invented certain new and useful Improvements in Inductive or Transformer Bonds, of which the following is a specification.

One feature of an inductive bond or transformer bond embodying my'invention' is the provision of an inclosing casing or shell of magnetic material, which casing or shell serves as a portion of the magnetic circuit for the bond.

I will describe one form of inductive bond and one form of transformer bond embodyin my invention and then. point out the novel features thereof in claims.

In the accompanying drawings, Figure 1 is a view showing in side elevation, with the inclosing casing in section, an inductive bond embodying my invention. Fig. 2 is an end view, partially sectioned, of the bond shown in Fig. 1. Fig. 3 is a view showing in cross section a transformer bond embodying my invention.

3 nilar reference characters refer to similar ts in each of the views.

A bond embodying my invention is intended, primarily, for use in the track of electric railways when both track rails are included in the propulsion current circuit and are divided at points by insulation to form block sections for signaling purposes. The bonds are located along the trackway aljacent the points of insulation, and are employed for conducting the propulsion current around these insulation points.

Referring now to the drawings, 10 desighates an inclosing shell or casing of magnetic material, preferably of 'cast iron. This casing is provided with a cap 11, also of magnetic material. Within the casing 10 is a core 12 of magnetic material, preferably of laminated soft iron, the laminations being arranged parallel with the longer axis of the core.- The winding for the bond is placed upon this core. After the bond is assembled, it is generally poured full of a waterproof insulating compound which makes the whole interior of the bond a solid mass and holds the winding and central core in place. For introducing this compound a hole may be provided in one of the heads which hole is afterward closed by a pipe plug, as shown at 21 in Fig. 2.

he core may be held in position within the casing in any suitable manner; for example, as shown in Figs. 1 and 2 it is secured by means of angle, members 18 bolted to the core and to the casing; as shown in Fig. 3 it is secured by means of the windings on the core; the leads thereto, and the insulating compound. In each of the modifications here shown, one end of the core is in contact with the bottom of the casing and an air gap is provided between the other end of the core and the cap 11. It will be.

understood however that other air gaps may be provided, or no air gap at all; the use or non-use of air gaps being dependent upon the conditions under which the bond is used. The air gaps maybe adjustable or non-adjustable. As shown in Fig. 3' the air gap is non-adjustable, the space which forms the gap being filled with a packing of non-magnetic material 20 such as press board. As shown in Figs. 1 and 2, the air gap 15 is rendered adjustable by means of a screw plug 14 in the cap 11 opposite the end of the core; it is of course understood however that other means may be provided for rendering the air gap adjustable.

The winding or windings for the bond comprise a suitable conductor or conductors wound upon the core 12, the terminals being carried out through suitable holes in the casing or cap or both. It will be seen that the magnetic circuit for this winding or windings comprises the core 12, the casing 10 and cap 11. Hence in a bond embodying my invention the inclosing shell or casing is included in the magnetic circuit for the bond, thereby reducing the size and cost of the bond for a given capacity.

In the form of inductive bond illustrated in Fig. 1, the winding, which is shown dia-'- grammatically, comprises two conductors 13 wound in close inductive relation with each other and in opposite directions, one end of one conductor being joined with the corresponding end of the other conductorat the point 16; a suitable conductor 0 is connected with the winding at the point 16. It will be clear from the drawing that if equal currents flow into the winding from A and B in the directions indicated by the arrows and out at C, the magnetic flux Q ployed.

- flow will be op versa, the core and easing will current, a relay,

two currents will be balanced and, consequently the casing and core will not be magnetized. But if current flows into the winding at A and out at B, or vice caused by these 'netized and if this current is alternating its 'bodying my invention, it is understood that any arrangement of winding or windings may be employed in accordance with the circumstances under which the device is em- Since the bond is usedin connection with alternating current, the casing 10 and cap 11 are preferably provided with a slot 17 extending from about the center of one end to about the center of the other end, to prevent the shell from acting as a short circuited secondary for the alternating current. This slot 17 is preferably filled with a suitable non-conducting material which will render the shell water-proof.

Although I have herein shown and described only two forms of bond embodying my invention, it is understood that various modifications may be made therein within the scope of the appended claims without departing from the spirit and scope of my invention.

matter of an a iplication by Laurence be magposed by the impedance of.

,and the core,

magnetic 1 do not claim the'adjustable air gap 15 shown herein, this feature being the sub ect- Hawkins filed lay 17 1913, Serial No. 7 68,302, ior inductive bonds.

Having thus described my invention,what

I claim is:

1. An inductive or transformer bond comprising an inclosing casing of magnetic material, a core of magnetic material contained within the casin one end of the core bein in contact with t e casing and the other en being separated from the casing by an air gap, and a winding on the core, the magnetic circuit for the winding comprising the core, the casing and the air gap. v

2. An inductive bond comprising a cylindrical casing of magnetic material, a laminated core axially arranged within said casing and a double winding on said core, each portion of the winding consistin of a conductor which enters at one end 0 the casing, passes around the core and passes out through the other end of the casing.

' 3. An inductive or transformer bond comprising an inclosing casing of ma etic material, a core of magnetic material within the casing, an air gap between the casing and a winding on the core the circuit for the winding comprising the casing and theair gap.

whereof I aifix my signature two witnesses. JOHNS. LENNOX. Witnesses:

A. B. HENDRICKS, Sr., -J. L. Huenns;

the core,

In testimon in presence 0 

